SCons: Remove old Python 2 compat code

Author: akien-mga

tools/ios.py

@@ -5,17 +5,6 @@
 import common_compiler_flags
 from SCons.Variables import BoolVariable
 
-if sys.version_info < (3,):
-
-    def decode_utf8(x):
-        return x
-
-else:
-    import codecs
-
-    def decode_utf8(x):
-        return codecs.utf_8_decode(x)[0]
-
 
 def has_ios_osxcross():
     return "OSXCROSS_IOS" in os.environ